Abstract
One hundred and fifty fecal samples from dogs with acute diarrhea (Group 1) and from 50 dogs without diarrhea (Group 2) were collected and analyzed at the Veterinary Teaching Hospital of the State University of Londrina, between October, 2004 and October 2005. From the positive samples (29.3%) of Group 1, 72.7% were infected by only one agent, while 27.3% had mixed infection. The following genera were observed by coproparasitologic evaluation: Giardia sp. (9.3%), Ancylostoma sp. (7.3%), Cystoisospora (7.3%), Entamoeba sp. (6.7%), Toxocara sp.(4%), Pentatrichomanas hominis (3.3%), and Trichuris vulpis (1.3%). From the 50 animals without diarrhea, six (12%) were positive by coproparasitologic evaluation: two (4%) for Ancylostoma sp., three (6%) with Giardia sp., and one (2%) for both Ancylostoma sp. and Cystoisospora sp. There was a significant relationship between infection and diarrhea (P = 0,005), age and infection (P
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